Vintage Asylum

Replacement for uPC1237 Protection IC?

63.246.183.22

Triode_Kingdom

A

I'm designing a VT line stage and need something like the old uPC1237 to sense DC offset and control a relay. It appears these parts are obsolete now, and there are very few for sale except the questionable products being shipped from China. Does anyone know if there's a contemporary replacement for this older chip? I don't mean an exact replacement like the NTE7100, but something new that would include most of the same features. I need DC offset detect, startup delay, instant off and a relay driver. This can be done with a timer and opamps of course, but a single device sure simplifies design. Any help would be appreciated.

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Buy Chinese. Bury freedom.

Follow Ups:

RE: Replacement for uPC1237 Protection IC? - tubular.well 12:46:02 08/18/17 (1)
An arduino + some programming might be all that is needed ?
- I give up... - Triode_Kingdom 10:04:49 08/19/17 (0)
  Well, after considering a number of options (including PICs), I've decided to use the uPC1237 after all. It's just the simplest way that I can see to get this done. I purchased a couple of the NTE equivalents to avoid the Chinese knock-offs sold on eBay. I hate building with obsolete semiconductors, but I'll buy a few more over time for spares. These things last practically forever, so it shouldn't be a problem.
  
  Thanks for everyone's suggestions!
  
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  Buy Chinese. Bury freedom.
RE: Replacement for uPC1237 Protection IC? - fredtr 14:04:12 08/13/17 (2)
You could do it with an 8 or 12 bit PIC chip with built-in A/D, timers and IO.
- What are Contemporary Amplifier Manufacturers Using? - Triode_Kingdom 22:14:05 08/13/17 (1)
  Yes, I'm familiar with PICs. Is that what amplifier manufacturers are using? Or are they building this functionality into a main LSI that performs many duties? Something else? Surely the high end manufacturers haven't all reinvented the wheel with opamps and timers?
  
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  Buy Chinese. Bury freedom.
  - RE: What are Contemporary Amplifier Manufacturers Using? - fredtr 07:05:51 08/14/17 (0)
    I'm guessing that you are correct, whatever devices that were used in the past are now obsolete with the function handled by the micro-controller that does everything else. This is just a guess, the rational is that integrated amplifiers/receivers are the bulk of the market, power amplifiers don't have the quantities to warrant the R&D. One possible exception is the automotive market and I have only worked on a couple of those. You might look at some of the 12 volt amplifiers, and see if they even have a relay how it is controlled.

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